In the above mentioned article by Cocoros et alReference Cocoros, Ochoa and Klompas1, the legend for figure 1 was incorrect due to an error introduced during typesetting. The correct figure 1 and legend appear below:
![](https://static.cambridge.org/binary/version/id/urn:cambridge.org:id:binary:20190704013558254-0356:S0899823X1900182X:S0899823X1900182X_figu1g.gif?pub-status=live)
The publisher apologizes for the error.